This was really informative about why North Korea is so weird, and gives general insight into the history of a region the history of which is quite opaque. For the methodology alone it is interesting. It seems to rely heavily on chinese and russian diplomatic accounts, accounts from defectors, and north korean media. Its almost like its the study of an ancient society being observed through the fog of time, rather than the study of a contemporary nation.
So as a basic summary, there were 4 original factions in North Korea at the dawn of its existence. The Soviet faction, the Chinese faction, the Manchurian/Guerilla faction, and the South Korean faction. Kim was from the Guerilla faction. Each faction was doing something different during ww2, thats where these labels come from, and that also determined their loyalties. The South Korean leftists were really the original stewards of communism in Korea (makes sense, thats where the population was and the cosmopolitan city), but they were quickly purged. The Chinese and Soviet factions were purged at later points in time, when they attempted to reign in the power of Kim as had happened post-Stalin in many Communist countries. So the Guerilla faction seized control and basically created a new faction of new cadres and peasants which was loyal to itself. The author seems to say that democracy and prosperity were basically alien to North Korea, and nationalism was a stronger current to exploit, and dovetailed more easily with Kim's personality cult than with the party-rule system advocated by the others. There was no popular push for representation or liberality. Its pretty weird, but the Chinese and Soviet factions were really the closest things to "liberals" in this case.